All righty then...the Aquatic Ape theory, from what I understand, basically states that early humans evolved aqautic envioronments instead of a more widely accetped savannah approach.

AA theory claims that relatively hairless bodies (like aquatic and semi-aquatic mammals such as walruses, hippos, dolphins, etc) are evidence for life in water.

Body fat composition in infants, as compared to other primates, seem quite suited to give that extra bouyancy that would be needed for wet environments.

Gives an explanantion as for a reason to stand up on hind legs...to keep that head above water, as opposed to stand an look out for predators. Today animals from prairie dogs and meer cats to baboons all stand on two legs to scout for predators, but all run away on four legs, which is much faster.

These are some of the ideas that Elaine Morgan came up with in here series of books on the subject. I don't beleive she had any real training in science, but alot of what she says is interesting.

I am hardly an expert in evolutionary theory, although I have read very extensively on the subject, but I am rather partial to the Aquatic Ape theory. It does offer explanations for many things that the 'standard' theories cannot explain yet, such as our hairlessness and hair flow patterns, types of body fats in infants, etc (watch a bunch of other evolutionists shoot me down in flames for that lot), but I have seen nothing to validate or invalidate the theory yet, so I guess we can 'accept' it for the present. It is certainly fascinating.

Hope we get some good discussion on this topic, but it is difficult to get it going without quoting large sections of the books. Does anyone out there know of a good web site that discusses this theory? I will do some searching.

I have to agree that the Aquatic Ape theory seems to make more sense than the savannah theory. You forgot the breathing aspect of the theory, in that we are the only land mammal with breath control and a descended larynx, which are telling indications of a possible aquatic ancestor.

Also, the only other animal with a perpendicular gait is aquatic (the penguin).

We waste a great deal of salt to sweat, which would seem detrimental in the savannah.

No other land animal cries, but the walrus, otter, and various marine birds and reptiles do.

Our glands which secrete oil are huge compared to chimps, and these oil glands are often used for waterproofing.

The list of answers that the aquatic ape theory gives us is long indeed.

The major problem is unconstrained invocation of adaptionism to explain just about everything, with little attempt to test the hypothesis, and with poor research in developing the facts that are used in the explanation.

I'm unfortunately not knowledgable in primates ethology but I can't believe that aquatic was a safe place to live in the context of he is exposed. The Savannah was also under the rule of large predators but the space was wide open. You can't reach the same conclusion near or in a pool. Never heard about crocodiles, thirsty felidae?

You forgot the breathing aspect of the theory, in that we are the only land mammal with breath control and a descended larynx, which are telling indications of a possible aquatic ancestor.

Also, the only other animal with a perpendicular gait is aquatic (the penguin).

We waste a great deal of salt to sweat, which would seem detrimental in the savannah.

No other land animal cries, but the walrus, otter, and various marine birds and reptiles do.

Our glands which secrete oil are huge compared to chimps, and these oil glands are often used for waterproofing.

The kinds of control which arise from a descended larynx have nothing to do with breathing in water; it is fairly plainly linked to vocalization. Furthermore, the larynx is not descended at birth; but comes later in childhood; but the breath control which Morgan also like to invoke is present from birth. The human larynx is nothing much like the larynx of truly aquatic animals. Fossil evidence also indicate that this arose much after the development of bipedalism.

The comparison with a penguins proposed as a line of evidence is hilarious. Have you seen a penguin walk?

The invocation of sweat is interesting; why would an aquatic animal need to sweat? The answer proposed by Morgan is that they need to get rid of salt (assuming salt water lifestyles). This is contradicted by the evidence, which shows that human sweat does not in fact have any excessive concentration of salt as is found in animals where salt secretion is an adaption.

The claim about animals crying is wrong. Most vertebrates shed tears. Morgan originally tried to distinguish "emotional" tears; but the association of this subtle distinction with acquatic adaptions is odd and ridiculous; and even the sources she was using proposed examples of other animals shedding emotional tears.

Morgan has indeed publically retracted some of her arguments about sweating and tears in response to various counter examples. See this Usenet post from May 1996. This is not, alas, prevent the recurrence of this rather dreadful argument.

I have not heard the one about oil before; but I'll bet that there is no credible basis or argument for thinking that humans ever had glands for water proofing or any need for such a thing. I'll look into it if you can give a reference.

I'm unfortunately not knowledgable in primates ethology but I can't believe that aquatic was a safe place to live in the context of he is exposed. The Savannah was also under the rule of large predators but the space was wide open. You can't reach the same conclusion near or in a pool. Never heard about crocodiles, thirsty felidae?

Sorry, I don't quite understand this question. My point is that "savannah" is usually invoked by Morgan in the context of a kind of strawman of an arid treeless plain to set against her own even more absurd ideas.

There are various notions for the kind of environment in which humans developed. The notion of a treeless savannah is not a serious contender.

As for your point about predators... it is absolutely correct. Morgan has been known to invoke escape from predators as one of the reasons for an aquatic phase in human evolution. This shows a startling ignorance of how to keep away from predators, and fails to account for how ludicrously ill adapted we are for using water as an escape route.

This isn't a very hard task to study. Paleosol specialists are able to tell us if there was trees or smaller vegetation on various locations. I still can't swallow the aquatic pill. There is too much contradictions. I guess these have never paddled in a swamp with mud above the knees. Try that once and enjoy it!

I was operating off of her original book, and her theory sounded interesting. I just wanted to fill in the rest of the tenets of the theory that were missed. I apologize for posting falsified data, I haven't read it for a while.

I'll do some research on that oil thing, independent of Morgan, but I doubt I'll find anything. The penguin comparison was hers, by the way, and I almost left it out. I didn't really think the comparison between a human and a bird was relevant, but she seemed to think it was important.